ducktape/cloud_storage: Wait for topic info

The test asserts that rpk can describe topic, however there are test
runs where the topic creation happens slightly after the topic info is
requested.

This change wraps the describe operation in a wait loop so that the
describe op is retried until it succeeds.

(cherry picked from commit 99830f0)

tests/rptest/tests/e2e_shadow_indexing_test.py

@@ -584,6 +584,15 @@ def test_recover_after_delete_records(self):
         assert response[0].error_msg == '', f"Err msg: {response[0].error_msg}"
         assert new_lwm == response[0].new_start_offset, response[
             0].new_start_offset
+
+        def topic_info_populated():
+            return len(list(rpk.describe_topic(self.topic))) == 1
+
+        wait_until(topic_info_populated,
+                   timeout_sec=60,
+                   backoff_sec=1,
+                   err_msg=f"topic info not available for {self.topic}")
+
         topics_info = list(rpk.describe_topic(self.topic))
         assert len(topics_info) == 1
         assert topics_info[0].start_offset == new_lwm, topics_info
@@ -611,6 +620,11 @@ def manifest_has_start_override():
         wait_until(lambda: len(set(rpk.list_topics())) == 1,
                    timeout_sec=30,
                    backoff_sec=1)
+
+        wait_until(topic_info_populated,
+                   timeout_sec=60,
+                   backoff_sec=1,
+                   err_msg=f"topic info not available for {self.topic}")
         topics_info = list(rpk.describe_topic(self.topic))
         assert len(topics_info) == 1
         assert topics_info[0].start_offset == new_lwm, topics_info